Logo ROOT   6.10/09
Reference Guide
reverseaxis.C File Reference

Detailed Description

View in nbviewer Open in SWAN Example showing an histogram with reverse axis.

pict1_reverseaxis.C.png
void ReverseXAxis (TH1 *h);
void ReverseYAxis (TH1 *h);
void reverseaxis()
{
TH2F *hpxpy = new TH2F("hpxpy","py vs px",40,-4,4,40,-4,4);
Float_t px, py;
for (Int_t i = 0; i < 25000; i++) {
r.Rannor(px,py);
hpxpy->Fill(px,py);
}
TCanvas *c1 = new TCanvas("c1");
hpxpy->Draw("colz");
ReverseXAxis(hpxpy);
ReverseYAxis(hpxpy);
}
void ReverseXAxis(TH1 *h)
{
// Remove the current axis
// Redraw the new axis
gPad->Update();
TGaxis *newaxis = new TGaxis(gPad->GetUxmax(),
gPad->GetUymin(),
gPad->GetUxmin(),
gPad->GetUymin(),
h->GetXaxis()->GetXmin(),
h->GetXaxis()->GetXmax(),
510,"-");
newaxis->SetLabelOffset(-0.03);
newaxis->Draw();
}
void ReverseYAxis(TH1 *h)
{
// Remove the current axis
// Redraw the new axis
gPad->Update();
TGaxis *newaxis = new TGaxis(gPad->GetUxmin(),
gPad->GetUymax(),
gPad->GetUxmin()-0.001,
gPad->GetUymin(),
h->GetYaxis()->GetXmin(),
h->GetYaxis()->GetXmax(),
510,"+");
newaxis->SetLabelOffset(-0.03);
newaxis->Draw();
}
Author
Olivier Couet

Definition in file reverseaxis.C.